The highest bacterial concentrations were on toilet flush handles. But on average, fixtures in copper-equipped rooms had concentrations of bacteria about 98 percent lower than in rooms furnished with traditional equipment, whether the rooms were occupied or not. On half of the copper components, the researchers were unable to grow any bacteria at all.

“Copper in hospital rooms is not yet common,” said the lead author, Shannon M. Hinsa-Leasure, an associate professor of biology at Grinnell College in Iowa. “Most bacteria in hospital rooms are not that harmful, but there are dangerous bacteria, and copper can be useful in minimizing them.

“This is only one way in which we can reduce infections among patients,” she added. “There are many other methods as well.”

A version of this article appears in print on , on Page D6 of the New York edition with the headline: Doctors; Copper May Stem Infections. Order Reprints | Today’s Paper | Subscribe